I'd go with the USB dock myself Dave, best of both worlds as it were [Y]
Don't forget you can have the option of 2 SD card slots should you decide to spec or retro-fit the RNS-E nav unit, so thats another option...
Don't forget you can have the option of 2 SD card slots should you decide to spec or retro-fit the RNS-E nav unit, so thats another option...